Draft-equalizer



- (No Model.)

P. EVANS. DRAFT EQUALIZER.

No. 483,911. Patehted 0012.4, 1892.

UNITED STATES PATENT QFFIQE. A

PHELPS EVANS, OF BOND HEAD, CANADA, ASSIGNOR TO IRA CLARKE EVANS, orTACOMA, WASHINGTON.

DRAFT-EQUALIZER.

SPECIFICATION forming part of Letters Patent No. 483,911, dated October4, 1892.

Application filed May 4, 1892.

To aZZ whom it may concern.-

Be it known that I, PHELPS EVANS, of the village of Bond Head, in thecounty of Simcoe, in the Province of Ontario, Canada, have inventedacertain new and Improved Equalizer for Tripletrees, of which thefollowing is a specification.

The object of the invention is to arrange a tripletree on the tongue ofa vehicle or machine so that the draft shall be centrally directedsubstantially parallel with the tongue; and it consists, essentially, ofa lever extending across the tongue,its long end having the third-horsewhiffletree pivoted upon it, while its short end is pivoted to the outerend of a bar fastened to the tongue. On the tongue I place a slidingblock, upon which the doubletree is pivoted, the block being connectedto the lever by a rope or chain passing backward over an eccentricpulley set in the tongue in such a manner that the draft of all threehorses shall be centrally directed substantially parallel with thetongue of the vehicle or machine, substantially as hereinafter moreparticularly explained.

Figure 1 is a perspective view of my improvedv equalizer for tripletreesset for three horses. Fig. 2 is a similar view of the device set for twohorses.

In the drawings, A represents a lever, upon the long end of which ispivoted the whiftletree B, the short end being pivoted to the outer endof the bar B, which is fastened at right angles to the tongue D, while Eis a stirrup supporting the lever A under the tongue D, and O is a braceextending diagonally to the tongue D, or it may be carried straight backto some convenient point of the machine.

E is a block slidingly held upon the tongue D, as indicated, and uponwhich the doubletree F is pivoted.

G is a rope or chain fixed at one end to the block E, and after passingbackward around the eccentric pulley H is connected at its other end tothe lever A at a point immediately under the tongue D.

J is a hasp pivoted on the tongue D and designed to fit over a pin K onthe sliding block E when it is desired to use only two horses. Whenthree are to be used, the hasp $erial No. 431,802. (No model.)

J is lifted from the pin K, leaving the blockE free. Consequently anydraft on the doubletree F will be directed around the pulley H againstthe lever A, owing to the connection formed between the two by the ropeor chain G, and the draft of the horse connected to the whiffletree B onthe lever A pulls against the draft of the horses hitched to thedoubletree F and their combined draft is'directed through the lever Aaround the pulley H on a straight line with the tongue D.

In order that the draft of all three horses be equal, the third orsingle horse requires double the leverage given the other two, whichpull together. As the third horse would not have working room alongsidethe team were the lever A only long enough to give an equalized draft,Ilengthen it and compensate to the team for the increased leverage theyhave to pull against by increasing their leverage over the third horseon the pulley H by pivoting it eccentrically and set it with its greaterdiameter vertically above the tongue D. The rope or chain G,beingfastened to the rear side of the pulley I-I, maintains the leverage inthe proper position.

The travel of the equalizer in either direction is regulated by a pin I,projecting from the sides of the pulley H, which, striking the tongue D,arrests further movement in that direction.

If there, were room for the third horse to Work alongside of the team.with only the double leverage required to pull against the team, itwould notbe necessary to pivot the pulley H eccentrically; but as I havefound in practice that it was necessary to increase the length of thelever A in order to give the third horse sufficient room I haveincreased the leverage for the team by pivoting the pulley Heccentrically and set it so that the distance from its pivot-point toits top circumference shall be sufficiently greater than the distancefrom its pivot to its lower circumference to give the increase inleverage required to compensate the increase in leverage given to thethird horse.

What I claim as my invention is- 1. A lever pivoted on a bar extendingfrom one side of the tongue, a whiffletree pivoted on the end of thesaidlever, and a sliding block supported on the tongue and connected tothe lever by a chain or rope extending around a pulley pivoted in thetongue, substantially as and for the purpose specified.

2. A lever pivoted on a bar extending from one side of the tongue, atwhiffletree pivoted on the end of the said lever, and a sliding blocksupported on the tongue and connected to the lever by a chain or ropeextending around a pulley eccentrically pivoted in the tongue,substantially as and for the purpose specified.

In presence of MARK SoANLoN, T. S. GRAHAM.

